EP 0524495 B1 19961009 - Process for the preparation of pyranones and pyrandiones
Title (en)
Process for the preparation of pyranones and pyrandiones
Title (de)
Verfahren zur Herstellung von Pyranonen und Pyrandionen
Title (fr)
Procédé pour la préparation des pyranones et pyrandiones
Publication
Application
Priority
- US 73440891 A 19910723
- US 84990892 A 19920312
Abstract (en)
[origin: EP0524495A1] A process for the preparation of a tautomeric mixture of compounds of formulae <CHEM> wherein W is hydrogen or C6H13, which comprises treating a compound of the formula <CHEM> wherein R is unsubstituted or substituted alkoxy, arylalkoxy, aryloxy or amine and R<1> is hydrogen or when R is alkoxy, substituted alkoxy, substituted amine, unsubstituted or substituted arylalkoxy R<1> can also be metal, with a compound of formula <CHEM> wherein one of X and Y is a reducible group and the other is hydrogen or a reducible group, and Z is hydroxy or a leaving group, and the obtained compound of formula <CHEM> is treated with a low valent metal to form a tautomeric mixture of compounds of formulas I and Ia, which are useful in the synthesis of tetrahydrolipstatin.
IPC 1-7
IPC 8 full level
C07C 69/63 (2006.01); C07C 69/675 (2006.01); C07D 309/32 (2006.01)
CPC (source: EP US)
C07C 69/675 (2013.01 - EP US); C07D 309/32 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB IT LI NL
DOCDB simple family (publication)
EP 0524495 A1 19930127; EP 0524495 B1 19961009; AT E143954 T1 19961015; DE 69214369 D1 19961114; DE 69214369 T2 19970327; DK 0524495 T3 19961125; ES 2092603 T3 19961201; JP 3248760 B2 20020121; JP H05194471 A 19930803; US 5274143 A 19931228; US 5420305 A 19950530
DOCDB simple family (application)
EP 92111663 A 19920709; AT 92111663 T 19920709; DE 69214369 T 19920709; DK 92111663 T 19920709; ES 92111663 T 19920709; JP 21573492 A 19920722; US 13184393 A 19931004; US 84990892 A 19920312